Basically, outlet and register have different meanings, in Dealpos when you create a new outlet it will automatically create 1 register but you can add more registers to the outlet so that one outlet can have several registers. Here are the differences between outlets and registers:
Outlet: Store/Business Location.
Register: Where the customer/cashier makes transactions.
You can check the Outlet list on the Outlets menu and choose the outlet tab:
You can check the register on the Outlets menu and choose the register tab.
You might also like to read this article :
Getting Started for Marketplace Integration and see any marketplace that sync.